Chuck



"June 2, 1942. A. M. s'roNER 2,285,101 r CHUCK Filed March 30,' 1940 l 40 2Q/Mfr ff Patented June 2, 1942 NT OFFICE 2,285,101 CHUCK ArthuraMerrick Stoner, West Hartford, Conn.,

assignor .tof The Jacobs., Manufacturing .Company; Hartf,ord, Conn.,` a corporation of'Connecticut ApplicationMarch 30, 1940, Serial No. 326,860

8 Claims. .(Cl. 279-44) and the body of the chuck is constructed with a transverse slot to receive a tang on the gripped end of the tool, whereby it is driven positively.Y When tools with tangs of different widthsare* used there is some lost motion between the body of the chuck and thetools with narrower tangs which in some cases is undesirable, especially when the chuck is used with taps with their, squared ends inserted in the slots.

' It is the purpose of this invention to further improve chucks of this general character and to provide for a closer t for the positively driven end of the tool and the chuck. For cases in which any back lash is undesirable, as when the l chucks are used on a lead screw tapping machine,

the driving parts of a chuck made accordingV to the present invention may be clamped onto the tool.

Another feature of this invention is to provide an arrangement for facilitating the connection of the chuck with machine tools of different construction by making it to receive adaptors for conection with different machines.

I will describevmy invention in the following specification and point out its novel features in appended claims.

Referring to the drawing, Fig. 1 is a sectional side elevation of a chuck which is made according to and embodies my invention;

Fig. 2 is a rear end view of the chuck shown in Fig. 1;

Fig. 3 is an end View partly in section of some ofthe parts shownin Fig. l, the section being taken on the line 3-3 of the latter iigure;

Fig. 4 is a front elevation and Fig. 5 a rear elevation of the parts shown in Fig. 3;

f Figs. 6, 7 and 8 are elevations of adaptors of different form from the one shown 'in Fig. 1;

Fig. 9 is a view similar to'Fig. 3 illustrating a .simplified modification of construction; and I Fig. 10 is a rear elevation of the parts shown in Fig. 9.

Il designates the bodyof-the-chuck. This 4has an externally threaded cylindrical portionilZ and an inner conical surface I3.

20 designates a nut having 'an internally threaded cylindrical portion 2| adapted to `iit the portions I2 of the b ody. f2.2v designates a ilange at the front end of the nut inwhich isl a central orice 23.

30 designates the roller retainer. This is in the formof a truncated conel of `an angularity corresponding with that of the conical surface i3 and has an axial borej32. 1, 33 designatesl a boss extending from the larger end of the retainer adapted tov fit rotativelyin the orifice Y23 of the nut. The surface 34 of'therretainer is adaptedto beseated on the inner surface vof the flange of the nut." The outer end 'of the boss. is riveted over the outer end of the flange ofthe nut to hold these parts together. /Theretainer is constructed with longitudinallyl disposedislots to receive tapered rollers 35, the. larger ,end vof which abuts beveled surfaces 36 ofthe retainer. Back of the conical opening I3 is a transverse bore I4 in which is rotatively supported a tool driving device which comprises two cylindrical membersV @Ii and 5I! interconnected by ascrew 4I having a head 42 in whichgis a hexagonal socket 43. This screwpasses through a clearance bore through the member Aand engages internal threads in the .memberi 144 designates -a nut having a left hand thread engaging a reduced end portion of the screwv 4i. Apin .45 interconnects the members 4I! and Eiland insures them rotating in unison. The member 40 has a head 46 which overlaps the body `I I of the chuck. 41 designates a pocket which receives the nut 144. The member 59 has a similar head ,.56 with. a pocket 57 which receives the head, j42 of the screw.

Notches 6I, 62, 63 and .64 ,of dierent sizesA are cut in the end of member .'40 ,oppositelitshead and similar notches `5I,5253and Vt'u'lare cut Ain ythe inner end of member correspondingto and in angular alinement with theznotchesy kin the member 40. In angular alinement with these notches are radially disposedslots V6IA;,;6 2A63A and 64A in the head 46 of widths corleSpOnding to the Widths of the notches. "These, slots'have flat parallel sides.

65 designates a Abutton lhavingra Vrounded endV which is pressed by a spring 66 into engagement With the notches 6I, 5I,-etc. This performs the duall function of Vforming anon-positivestop to hold the opposite notches inalinernentwith the axis of the-chuck body andfofv mo'ving'the members 40 and 5t apart as far as the adjustment of the screw 4I permits.

The rear end of the body H is constructed with a cylindrical bore I5 and across the rear end of the body a transverse slot l is cut. An adaptor having a cylindrical bodyV 23 and oppositely extending ears 2li ts into the bore l5 and the slot IB. An annular groove 25 is cut in the body 23 intermediate its ends. l'l designates a set screw in the chuck body il projecting into this groove 25 to hold the adaptor against longitudinal movement. The adaptor shown in Fig. l has a tapered bore 25 adapted to fit a similarly tapered shank of a machine tool.

The adaptor shown in Fig. 6Yhas a tapered shank 2. That shown in Fig. 7 has an internally threaded bore 28 and the one shown in Fig. 8

has an externally threaded boss 29. Obviously, these adaptors may be interchanged to fix various driving elements of machine tools.

Before describing the modification illustrated in Figs. 9 and 10, I will describe how this chuck is used with a tap having a shank l and a square end 1I, (Fig. 1).

The squared end |'l is first inserted in that one of the radial slots in the head it which fits it best such, for example, as the slot 65A. The members 49 and 4i are then turned to bring the slot 6 IA into the position where it faces the front of the chuck. This will bring the notches I, 5| into axial alinement with the chuck body. The button 65 tends to hold the members et and 5I! in this position and spread them apart, as

`shown in Fig. 3. The tap will be placed then in the chuck and its squared end will enter the space between the notches 6| and 5l. The tap may then be centered by tightening the nut 2t on the chuck body. When used as thus described the members 40 and 50 form means for driving the tap positively.

When desired to eliminate any possible lost motion between the end 'Il of the tap and the members 4i] and 5S, a further tightening operation may be performed by inserting a suitable tool in the opening 43 and turning the screw 4i, This will bring the members d and 5@ together to clamp the end ll of the tap firmly.

In the modification shown in Figs. 9 and 1), a single cylindrical member 8] is used instead of the two members d0 and 5l] previously described.

This member is provided with transverse slots 8|, 82, 83 and 84 of different widths. It has a head 86 in which are radially disposed slots BIA, 82A, 83A and 84A corresponding in width with the width of the transverse slots 8|, 82, 83 and 84. A threaded boss 81 of reduced diameter extends from the end of member 853 opposite its head. This receives a nut 83 to hold the member in the chuck body Il. The operation of this device needs no further description.

Structural modifications have been illustrated and described to show that the invention is not limited to any particular construction and I intend no limitations other than those imposed by the following claims.

What I claim is:

1. In a chuck of the type which comprises a body and elements supported by the body for centeringa tool by engaging a shank thereof, a device comprising a pair of cylindrical members rotatable in the body about a transverse axis back of said elements, corresponding radial tool engaging notches of different sizes in the proximate Vfacesof said members, and means adapted to re ceive a tool for rotating said device to bring said notches into tool engaging position.

2. In a chuck of the type which comprises a body and elements supported by the body for centering a tool by engaging a shank thereof, a device comprising a pair of cylindrical members rotatable in the body about a transverse axis back of said elements, corresponding radial tool engaging notches of different sizes in the proximate faces of said members, means adapted to receive a tool for rotating said device to bring said notches into tool engaging position, and a nonpositive stop arranged to hold the device in its adjusted position.

`3. In a chuck of the type which comprises a body and elements supported by the body for centering a tool by engaging a shank thereof, a device comprising a pair of cylindrical members rotatable in the body about a transverse axis back of said elements, corresponding radial tool engaging notches of different sizes in the proximate faces of said members, means adapted to receive a tool for rotating said device to bring said notches into tool engaging position, and a non-positive stop arranged to engage said notches to hold the device in its adjusted position.

Ll.V In a chuck of the type which comprises a body and elements supported by the body for centering a tool by engaging a shank thereof, a device comprising a pair of cylindrical members rotatable in the body about a transverse axis back of said elements, corresponding radial tool engaging notches of different sizes in the proximate faces of said members, said device being constructed with a plurality of radially disposed slots outside of said body of widths corresponding to the sizes of said notches whereby the device may be rotated to bring a desired pair of said notches into tool engaging position.

5. In a chuck of the type which comprises a body and elements supported by the body for centering a tool by engaging a shank thereof, a device comprising a pair of cylindrical members rotatable in the body about a transverse axis back of said elements, corresponding radial tool engaging notches of different sizes in the proximate faces of said members, said device being constructed with a plurality of radially disposed slots outside of said body of widths corresponding to the sizes of said notches whereby the device may be rotated to bring a desired pair of said notches into tool engaging position, and a non-positive stop arranged to engage said notches to hold the device in its adjusted positions.

6. In a chuck of the type which comprises a body and elements supported by the body for centering a tool by engaging a shank'thereof, a pair of members rotatable in the body about a transverse axis back of said elements, said members having a limited axial relative movement, notches of different sizes in the proximate faces of said members, means for forcing said members toward each other, means adapted, to re- 7. I'n a chuck of the type which comprises a body and elements supported by the body forY relative movement, corresponding radial tool engaging notches of different sizes in the proximate faces of said members, and means for forcing said members toward each other, and means adapted to'receive 'a tool for rotating saidmembers in unison to bring any pair of said notches into tool engaging position.

8. In a chuck of the type which comprises a body and elements supported by the body for centering a tool by engaging a shank thereof a device comprisingfa pair of members rotatable in the body about a transverse axis back oi said elements, said members having a limited axial relative movement, corresponding radial tool engaging notches of different sizes in the proximate faces of said members, means for forcing said members toward each other, means adapted to receive a tool for rotating said members in unison to bring any pair of said notches into tool engaging position, and a button arranged to be pressed into a pair of Vsaid notches other than the pair in tool engaging position arranged to separate the members and to hold themV nonpositively in their adjusted positions.

ARTHUR MERRICK STONER. 

